Biomes

PPG uses a baked biome-cell map to choose and blend biome data across the planet.

Cell Layout

The biome map stores six cube faces in one texture:

Texture width  = 6 * Biome Cell Resolution
Texture height = Biome Cell Resolution

Each texel represents one Voronoi cell. At runtime, the terrain shader samples the biome map, evaluates global height once, then evaluates the selected biome height.

The current shader implementation supports up to 16 biome entries.

Biome Mask Output Settings

Setting	Description
Biome Cell Resolution	Number of Voronoi cells along one cube face edge. Higher values add smaller biome cells and a larger generated texture.
Biome Cell Seed	Seed for deterministic cell placement.

These two settings live on the Planet Biome Mask Output node.

Elevation Output Settings

The following settings live on the Planet Elevation Output node:

Setting	Description
Biome Transition	Width of biome influence falloff around cells, expressed as a fraction of one cell.
Height Blend Biome Materials	Makes the strongest height contribution control material choice in transition areas.
Biome Material Height Blend Smoothness	Controls how lower biome materials fade out when height blending is enabled.
Biome Voronoi Warp Strength	Distorts the biome lookup position as a fraction of one cell. Zero disables warp.
Biome Voronoi Warp Scale	Frequency of the biome lookup warp.

Foliage Minimum Biome Blend Strength is a Planet Spawner performance setting. It ignores weak biome contributions during foliage generation.

Foliage and Biomes

Each biome entry can reference a Foliage Data Asset. During terrain generation, foliage can be spawned according to:

• biome blend strength
• terrain height
• terrain slope
• foliage density
• vertex-color density channels
• global foliage density scale on the spawner

Editing Biomes

After adding, removing, or reordering biome layers, run:

Rebuild Planet Pipeline

This updates material node pins, recompiles materials, refreshes the biome map, and regenerates placed planets.